SnoVARC > News And Updates > New Ham Net > New Ham Net 5/16/19
New Ham Net 5/16/19
- Power Supply Noise Issues
- One net participant had noise interference while listening on HF frequencies only when the power supply was on.
- The issue seemed to be specific to this power supply as it was possibly emitting lots of RFI due to insufficient shielding.
- Power Supplies (Linear vs Switching)
- No participants indicated that they were using or had used a linear power supply for their transceiver
- General consensus on the net seemed to be that a modern switching power supply is sufficient for powering HF/VHF/UHF transceivers
- It was noted that switching power supplies are more “noisy” as they emit their on RFI
- Switching power supplies that were mentioned by net participants without issues were
- Samlex SEC-1235
- Alinco DM-30T (PDF WARNING)
- 2m/70cm Propagation
- It was noted that signals were much cleaner for tonight’s net than during last week’s net
- One net participant was looking for a real-time propagation information for VHF/UHF bands. Although there isn’t much for general propagation conditions in a given area, sites like http://www.dxmaps.com and http://aprs.mennolink.org can give some UHF/VHF propagation information.
- Tropospheric ducting was discussed briefly. It was noted that occasionally, transmissions from a matching repeater input frequency out of Oregon, will be heard around our area as a result of ducting.
- Carnation Cross-Band Repeater
- There was a general inquiry about this repeater’s setup
- It was noted that this repeater transmits to the Duvall Bell repeater and not to the Cougar mountain repeater.
- SDR.HU A site with links to Web SDRs around the world.